12V DC Brushless Fan - I want it directly from a PV solar panel - panel size, but what?

Question j : 12V DC Brushless Fan - I want directly from a PV solar system - but that the size of the panel I have a 12V DC fan? brushless, 0.16 amps, 1.92 watts (from a desktop PC dead) evaluated. I want it directly from a solar module (not from a battery), so it only works in daylight and if there is a reasonable amount of sunlight (and not in times of heavy clouds) I want to know what size or type of photovoltaic (generating -. without doubt - about 2 watts at full sunlight and high

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